Correct option is A
The correct synonym of the given word is (a) Useless.
Futile: Incapable of producing any useful result; pointless. (Hindi meaning: व्यर्थ / निष्फल)
Example: Their efforts to save the ship were futile.
Useless: Having no use or purpose. (Hindi meaning: बेकार / निरर्थक)
Example: This broken tool is completely useless.
Synonyms: ineffective, fruitless, vain, hopeless.
Antonyms: effective, successful, fruitful.
Meanings of the other options:
· (b)
Vicious: Cruel or violent (क्रूर)
· (c)
Thoughtful: Considerate or reflective (सोच-समझ वाला)
· (d)
Adequate: Sufficient (पर्याप्त)